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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffd3a4f37c2bd6ce5515c2ccb2657dbc3a0c7399b933b2e5e86bf422f71b384' 
  AND token = 'y7FEIn4gd/kTJdSNQoDsvdrWwD1Tvq3dbm8ZlXw1G5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}